You are all making this too complicated with the Power Management stuff. The generator has two sets of power lines.
Line 1 goes to the big 30-amp outlet inside the storage area (where you plug in your 30-amp cord).
Line 2 goes directly to the back air conditioner. This is the line that many members here have modified.
Take the Line 2 from the generator and terminate it with a standard 15-amp outlet or the Female end of a cord.
Take the line that comes from the rear air conditioner and terminated it with a Male plug.
Now you can plug the rear A/C into the outlet for the generator OR plug it into an unused outlet at the campground electrical post.
You now have your 30-amp cord to the post which will run the front air and you will have a smaller 15-amp cord running to the post for your rear air.
Simple.
It took me a very hot August weekend in Las Vegas to motivate me enough to add the second cord;)